| /*============================================================================= |
| Copyright (c) 2014 Kohei Takahashi |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| ==============================================================================*/ |
| #if !defined(BOOST_FUSION_BUILD_STD_TUPLE_05292014_0100) |
| #define BOOST_FUSION_BUILD_STD_TUPLE_05292014_0100 |
| |
| #include <boost/fusion/support/config.hpp> |
| #include <boost/fusion/support/detail/index_sequence.hpp> |
| #include <boost/fusion/iterator/equal_to.hpp> |
| #include <boost/fusion/iterator/next.hpp> |
| #include <boost/fusion/iterator/value_of.hpp> |
| #include <boost/fusion/iterator/deref.hpp> |
| #include <tuple> |
| #include <cstddef> |
| |
| namespace boost { namespace fusion { namespace detail |
| { |
| template <typename First, typename Last, |
| bool is_empty = result_of::equal_to<First, Last>::value> |
| struct build_std_tuple; |
| |
| template <typename First, typename Last> |
| struct build_std_tuple<First, Last, true> |
| { |
| typedef std::tuple<> type; |
| |
| BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type |
| call(First const&, Last const&) |
| { |
| return type(); |
| } |
| }; |
| |
| template <typename T, typename Rest> |
| struct push_front_std_tuple; |
| |
| template <typename T, typename ...Rest> |
| struct push_front_std_tuple<T, std::tuple<Rest...> > |
| { |
| typedef std::tuple<T, Rest...> type; |
| |
| template <std::size_t ...I> |
| BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type |
| indexed_call(T const& first, std::tuple<Rest...> const& rest, index_sequence<I...>) |
| { |
| return type(first, std::get<I>(rest)...); |
| } |
| |
| BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type |
| call(T const& first, std::tuple<Rest...> const& rest) |
| { |
| typedef typename make_index_sequence<sizeof...(Rest)>::type gen; |
| return indexed_call(first, rest, gen()); |
| } |
| }; |
| |
| template <typename First, typename Last> |
| struct build_std_tuple<First, Last, false> |
| { |
| typedef |
| build_std_tuple<typename result_of::next<First>::type, Last> |
| next_build_std_tuple; |
| |
| typedef push_front_std_tuple< |
| typename result_of::value_of<First>::type |
| , typename next_build_std_tuple::type> |
| push_front; |
| |
| typedef typename push_front::type type; |
| |
| BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| static type |
| call(First const& f, Last const& l) |
| { |
| typename result_of::value_of<First>::type v = *f; |
| return push_front::call( |
| v, next_build_std_tuple::call(fusion::next(f), l)); |
| } |
| }; |
| }}} |
| |
| #endif |